Piston pump



The patent of application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawings will be provided by the Office upon request and payment of the necessary fee.

FIG. 1 is a perspective view of a first embodiment;

FIG. 2 is an upper plan view of the first embodiment;

FIG. 3 is a view from the lower end of FIG. 2;

FIG. 4 is a view fro the right end of FIG. 2;

FIG. 5 is a view from the left end of FIG. 2;

FIG. 6 is a bottom plan view of the first embodiment;

FIG. 7 is a view from the upper end of FIG. 2;

FIG. 8 is a perspective view of a second embodiment;

FIG. 9 is an upper plan view of the second embodiment;

FIG. 10 is a view from the lower end of FIG. 9;

FIG. 11 is a view from the right end of FIG. 9;

FIG. 12 is a view from the left end of FIG. 9;

FIG. 13 is a bottom plan view of the second embodiment;

FIG. 14 is a view from the upper end of FIG. 9;

FIG. 15 is a perspective view of a third embodiment;

FIG. 16 is an upper plan view of the third embodiment;

FIG. 17 is a view from the lower end of FIG. 16;

FIG. 18 is a view from the right end of FIG. 16;

FIG. 19 is a view from the left end of FIG. 16;

FIG. 20 is a bottom plan view of the third embodiment; and,

FIG. 21 is a view from the upper end of FIG. 16. 

The ornamental design for “piston pump,” as shown and described. 